Guided Tour | Vector Fields | Electrostatics | Magnetostatics | Faraday's Law | Light | Course Notes | Resources
MIT Physics 8.02 - Electricity & Magnetism

SECTION : Magnetostatics  

SUBJECT: The Floating Coil Applet  

NOTE: You must be connected to the Internet the first time you view this simulation, at which point the codebase for all the simulations will be downloaded to your computer. This process make take a few minutes, as the codebase is roughly 9MB in size. Subsequent viewings of the applets will run from your local copy.


This applet illustrates the forces on a current carrying coil sitting on the axis of a permanent magnet. For current flowing in one direction in the coil the force on the coil will be upward, and if the current is strong enough the coil will levitate, floating on the magnetic fields of the coil plus the magnet. This is the way one form of MagLev works. For the other direction of current the coil is attracted to the magnet The magnet has its north pole at the top, and the direction of positive current is counterclockwise when viewed from above. The coil initially rests at one coil radius above the magnet on a platform. There is a marker at two coil radii above the magnet. A quantitative problem at this link gives you an idea of the currents you need to get levitation in the simple experiments which this applet illustrates.



Start Simulation
(Note: you must have Java™ J2SE v1.4+ JRE installed)